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Jan 1 2010   6:36PM GMT

That vs. which (Part I)



Posted by: Ivy Wigmore
Tags:
Business writing
CIO
grammar
Quiz
restrictive and non-restrictive clauses
that/which

Which is correct?
Continuous data protection offers recovery options _______ are simply not possible with a traditional backup system.
a. that
b. which

Answer: a.

Explanation:

Grammar Girl Mignon Fogarty explains that vs. which and restrictive vs. non-restrictive clauses:

Restrictive Clause–That
A restrictive clause is just part of a sentence that you can’t get rid of because it specifically restricts some other part of the sentence. Here’s an example:

* Gems that sparkle often elicit forgiveness.

The words that sparkle restrict the kind of gems you’re talking about. Without them, the meaning of the sentence would change. Without them, you’d be saying that all gems elicit forgiveness, not just the gems that sparkle. (And note that you don’t need commas around the words that sparkle.)

Nonrestrictive Clause–Which
A nonrestrictive clause is something that can be left off without changing the meaning of the sentence. You can think of a nonrestrictive clause as simply additional information. Here’s an example:

* Diamonds, which are expensive, often elicit forgiveness.

Alas, in Grammar Girl’s world, diamonds are always expensive, so leaving out the words which are expensive doesn’t change the meaning of the sentence. (Also note that the phrase is surrounded by commas.)

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